A5071716922- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Quantum Chromodynamics and Particle Interactions
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Rare-earth and actinide compounds
- Particle physics theoretical and experimental studies
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Astro and Planetary Science
- X-ray Spectroscopy and Fluorescence Analysis
- Superconducting Materials and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Scientific Research and Discoveries
- Inorganic Fluorides and Related Compounds
- Neutrino Physics Research
- Gamma-ray bursts and supernovae
- Physics of Superconductivity and Magnetism
- Diamond and Carbon-based Materials Research
Lawrence Berkeley National Laboratory
2016-2025
North-West University
2023
Universidad Autónoma de Madrid
2023
Indian Institute of Technology Kharagpur
2016-2021
University of Connecticut
2021
University of Liverpool
1988-2019
Florida State University
1996-2018
East Carolina University
2018
Centre National de la Recherche Scientifique
1996-2016
GANIL
2007-2016
A highly tetrahedrally bonded form on nonhydrogenated amorphous carbon (a-C) is produced by deposition from filtered medium-energy ion beams. range of such films was grown and the ${\mathit{sp}}^{3}$-bonded fractions, plasmon energies, compressive stresses, resistivities were measured as a function energy. These properties are found to be strongly correlated each pass through maximum at an energy about 140 eV. The optimum observed depend type ions deposited and, possibly, flux rate. data...
The principal chemical mechanisms relevant to the growth of diamond from gaseous hydrogen and hydrocarbon species are presented. kinetic processes occurring during activation transport growing surface described, with key being generation subsequent reactions atomic hydrogen. structure, composition, dynamics discussed. A simple, non-stereospecific model process is presented which reveals most general characteristics process, such as H atom flux dependence rate quality. detailed at (110) sites...
The structure of recently discovered identical superdeformed bands in $^{151}\mathrm{Tb}$ and $^{152}\mathrm{Dy}$, $^{150}\mathrm{Gd}$ are discussed terms the strong-coupling approach. Based on experimental evidence that core $^{152}\mathrm{Dy}$ is extremely insensitive to polarization effects induced by odd particle, shown exhibit presence pseudo SU(3) symmetry at extreme conditions large elongations high spins.
Excited superdeformed bands have been observed in the N=86 isotones $^{150}\mathrm{Gd}$ and $^{151}\mathrm{Tb}$. The properties of these were found to closely resemble those yrast their Z+1 ${(}^{151}$Tb $^{52}\mathrm{Dy}$) such that, on average, transition energies are identical an accuracy 1:1000. It is proposed that excited based single-proton excitations from [301]1/2 orbital into [651]3/2 intruder thus they first obsrevation proton nuclei.
The new, neutron-deficient, superheavy element isotope ²⁸⁵114 was produced in ⁴⁸Ca irradiations of ²⁴²Pu targets at a center-of-target beam energy 256 MeV (E*=50 MeV). α decay ²⁸⁵114was followed by the sequential four daughter nuclides, 281Cn, 277Ds, 273Hs, and 269Sg. 265Rf observed to spontaneous fission. measured α-decay Q values were compared with those from macroscopic-microscopic nuclear mass model give insight into shell effects. The²⁴²Pu (⁴⁸Ca,5n²)²⁸⁵114 cross section 0.6(-0.5)+0.9 pb.
The ^{244}Pu(^{50}Ti,xn)^{294-x}Lv reaction was investigated at Lawrence Berkeley National Laboratory's 88-Inch Cyclotron. experiment aimed the production of a superheavy element with Z≥114 by irradiating an actinide target beam heavier than ^{48}Ca. Produced Lv ions were separated from unwanted and nuclear products using Gas-filled Separator implanted into newly commissioned focal-plane detector system. Two decay chains observed assigned to ^{290}Lv. cross section measured be...
Neutron-rich Zr and Mo isotopes were populated as fission fragments produced by the $^{238}\mathrm{U}(\ensuremath{\alpha},\mathit{f})$ fusion-fission reaction. The level schemes of these nuclei have been extended beyond first band crossing region, which can be ascribed to ${h}_{11∕2}$ neutron pair alignment. spin alignment signature splitting for $\ensuremath{\nu}{h}_{11∕2}$ orbitals in term triaxiality is addressed. frequency aligned bands even reproduced well calculations using cranked...
Discrete $\ensuremath{\gamma}$ rays directly connecting states of a superdeformed (SD) band in ${}^{194}\mathrm{Hg}$ to the yrast have been discovered. Thus, excitation energies and spins all members lowest SD are established for first time, together with their likely parity. The decays from its ${10}^{+}$ ${12}^{+}$ states, which lie 4204.8 4407.4 keV above normal-deformed same spins.
A superdeformed rotational band has been identified in 36Ar, linked to known low-spin states, and observed its high-spin termination at Iπ=16+. Cranked Nilsson-Strutinsky spherical shell model calculations assign the a configuration which four pf-shell orbitals are occupied, leading deformation β2≈0.45. Two major shells active for both protons neutrons, yet valence space remains small enough be confronted with model. This thus provides an ideal case study microscopic structure of collective...
Multinucleon transfer reactions have been used, for the first time, to populate high-spin bands of alternating parity states in ${}^{218,220,222}\mathrm{Rn}$ and ${}^{222,224,226}\mathrm{Ra}$. The behavior angular momentum alignment with rotational frequency Rn isotopes is very different when compared Ra Th $N\ensuremath{\approx}134$, indicating a transition from octupole vibrational stable deformation. Throughout measured spin range values $|{D}_{0}/{Q}_{0}|$ remain constant...
High spin states in 167Lu were populated through the 123Sb(48Ca,xn) reaction at 203 MeV. Four, presumably triaxial, strongly deformed (TSD) bands have been found this nucleus. Several transitions linking an excited TSD band (TSD2) to lowest (yrast) (TSD1) observed. The electromagnetic properties of connecting investigated. Evidence for assignment TSD2 as a wobbling mode built on TSD1 is presented. This based comparisons experimental data theoretical calculations. excitation unambiguous...
Two new features of superdeformed (SD) bands in the A≊190 region emerge from a study Hg194 with Gammasphere detector array. A decrease dynamic moment inertia is observed for rotational frequencies ħω≥0.4 MeV, confirming long standing expectations based on mean field calculations pairing. Evidence small staggering SD transition energies also observed, suggesting presence terms fourfold symmetry Hamiltonian.Received 17 November 1993DOI:https://doi.org/10.1103/PhysRevLett.72.3150©1994 American...
Excited states in $^{38,40,42}\mathrm{Si}$ nuclei have been studied via in-beam $\ensuremath{\gamma}$-ray spectroscopy with multinucleon removal reactions. Intense radioactive beams of $^{40}\mathrm{S}$ and $^{44}\mathrm{S}$ provided at the new facility RIKEN Radioactive Isotope Beam Factory enabled $\ensuremath{\gamma}\mathrm{\text{\ensuremath{-}}}\ensuremath{\gamma}$ coincidence measurements. A prominent $\ensuremath{\gamma}$ line observed an energy 742(8) keV $^{42}\mathrm{Si}$ confirms...
Intermediate-energy Coulomb excitation measurements are performed on the N ≥ 40 neutron-rich nuclei (66,68)Fe and (64)Cr. The reduced transition matrix elements providing a direct measure of quadrupole collectivity B(E2;2(1)(+) → 0(1)(+)) determined for first time in (68)Fe(42) (64)Cr(40) confirm previous recoil distance method lifetime measurement (66)Fe(40). results compared to state-of-the-art large-scale shell-model calculations within full fpgd neutron orbital model space using...
A new experimental technique is presented using proton-$\ensuremath{\gamma}\mathrm{\text{\ensuremath{-}}}\ensuremath{\gamma}$ correlations from $^{94}\mathrm{Mo}(d,p)^{95}\mathrm{Mo}$ reactions which allows for the model-independent extraction of photon strength function at various excitation energies primary $\ensuremath{\gamma}$-ray decay quasicontinuum to individual low-lying levels. Detected particle provide entrance into residual nucleus while transitions levels specify discrete states...
One of the most exotic light neutron-rich nuclei currently accessible for experimental study is 40Mg, which lies at intersection nucleon magic number N=28 and neutron drip line. Low-lying excited states 40Mg have been studied first time following a one-proton removal reaction from 41Al, performed Radioactive Isotope Beam Factory RIKEN Nishina Center with DALI2 γ-ray array ZeroDegree spectrometer. Two transitions were observed, suggesting an excitation spectrum that shows unexpected...
The properties of even-even nuclei with $30\ensuremath{\leqslant}\mathrm{Z}\ensuremath{\leqslant}82$, $\mathrm{A}\ensuremath{\geqslant}60$ have been examined to find examples displaying the characteristics $\mathrm{E}(5)$ critical-point behavior for shape transition from a spherical vibrator triaxially soft rotor. On basis known experimental state energies and $\mathrm{E}2$ strengths, best candidates that were identified are $^{102}\mathrm{Pd}$, $^{106,108}\mathrm{Cd}$, $^{124}\mathrm{Te}$,...